the ar-15 is the nation's most popular semiautomatic rifle, similar to the weapon used in the newtown shootings. in washington, meanwhile, the gun control debate ramped up. on "face the nation" bob schieffer spoke with national rifle association president david keane, the first time the toup has spoken since making a statement on friday. >> scheiffer: when you came on television at this news conference friday you seemed to blame the mentally ill. you seemed to blame hollywood. you seemed to blame the media, the video game manufacturers. you did not seem to think that your policies have had anything at all to do with this. o> well, we don't think they eave. >> scheiffer: you see no responsibility. >> you know, we're living in a country, a free country which ntryle have a right to exercise their second amendment rights. we're living in a country where in the last few decades as gun ownership has increased, violent crime has fallen. thoughe have, though, in this ,ountry are, and in any country, f percentage of people who are, frankly, either evil or crazy. >> glor: the nra says existing